The Role of Gold-Adsorbed Photosynthetic Reaction Centers and Redox Mediators in the Charge Transfer and Photocurrent Generation in a Bio-Photoelectrochemical Cell

2012 ◽  
Vol 116 (47) ◽  
pp. 24868-24877 ◽  
Author(s):  
Houman Yaghoubi ◽  
Zhi Li ◽  
Daniel Jun ◽  
Rafael Saer ◽  
Joanna E. Slota ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Reaction Centers ◽  
Photoelectrochemical Cell ◽  
Photosynthetic Reaction Centers ◽  
Redox Mediators ◽  
Photocurrent Generation

scholarly journals Rapid-scan FTIR difference spectroscopy applied to ubiquinone reduction in photosynthetic reaction centers: Role of redox mediators

2010 ◽  
Vol 24 (1-2) ◽  
pp. 79-87 ◽  
Author(s):  
Alberto Mezzetti
Keyword(s):  
Reaction Centers ◽  
Photosynthetic Reaction Centers ◽  
Difference Spectroscopy ◽  
Redox Mediators ◽  
Time Resolved ◽  
Rapid Scan ◽  
Primary Donor ◽  
Ftir Difference Spectroscopy ◽  
Kinetics Of

Rapid-scan FTIR difference spectroscopy was used to investigate light-induced reduction of the ubiquinone QB, and the oxidation kinetics of QB–and QH2by external mediators in isolated reaction centers (RCs) fromR. sphaeroides. As redox mediators, a Ferrocyanide/N,N,Nʹ,Nʹ-tetramethyl-p-phenylenediamine (TMPD) mixture and an Ascorbate/2,3,5,6-tetramethyl-p-phenylenediamine (DAD) mixture are compared.Results show that TMPDredrapidly reduces the photoproduced P870+primary donor. The process is fast enough to record rapid-scan FTIR spectra devoid of P870+bands down to 260 K. Results show also that TMPDoxoxidises both QB–and QH2faster than DADox. In particular, QB–is oxidised faster than QH2at all temperatures studied.Results are discussed in the framework of time-resolved infrared studies onR. sphaeroidesRCs, showing advantages/drawbacks of the proposed experimental approach.

scholarly journals On the role of tryptophan as a superexchange mediator for quinone reduction in photosynthetic reaction centers

FEBS Letters ◽  
1989 ◽  
Vol 249 (1) ◽  
pp. 70-74 ◽  
Author(s):  
M. Plato ◽  
M.E. Michel-Beyerle ◽  
M. Bixon ◽  
J. Jortner
Keyword(s):  
Reaction Centers ◽  
Photosynthetic Reaction Centers ◽  
Quinone Reduction
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